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Related Party Transactions (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Nov. 30, 2016 | Feb. 28, 2014 | Mar. 31, 2013 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |  |  |
Repayment of stockholders’ notes receivable |  |  |  |  | $ 0 | $ 84
Interest expense |  |  |  |  | $ 5,108 | 6,204
Chief Financial Officer |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Stockholders’ notes receivable |  |  |  | $ 200 |  |
Stockholders' note interest rate (percent) |  |  |  | 1.09% |  |
Repayment of stockholders’ notes receivable |  | $ 100 |  |  |  |
Chief Executive Officer |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Stockholders’ notes receivable |  |  | $ 400 |  |  |
Stockholders' note interest rate (percent) |  |  | 1.97% |  |  |
Chief Executive Officer | Forgiveness of Related Party Promissory Note |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Notes receivable forgiven | $ 200 |  |  |  |  |
Notes receivable percentage of principal approved for forgiveness | 50.00% |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  | 400
Interest expense |  |  |  |  |  | $ 100

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